Water flows over a section of Niagara Falls at a rate of 1.30 × 10^6 kg/s and falls 52.0 m. What is the power dissipated by the waterfall?
a. 6.6E+8 W
b. 6.8E+7 W
c. 4.0E+7 W
d. 5.3E+8 W
e. 8.6E+6 W
a
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Which of the following is true of the light emitted by the big bang gases?
A) It is detectable with infrared telescopes. B) It can no longer be used to detect the big bang. C) It is not detectable with radio telescopes. D) It can be seen with the unaided eye.
Consider the following statement, and explain whether or not it is sensible: Someday we may build spaceships capable of traveling at a speed of 1 light-second per hour
What will be an ideal response?
A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the lowest point, where 
is the normal force, 
is weight, and
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B.
C.
D.
E.
Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of salt water displaced by the ship is
A) greater than the volume of fresh water. B) less than the volume of fresh water. C) the same as the volume of fresh water.